If you liked TA, you might like the OpenSource adaption, TA-Spring.
http://taspring.clan-sy.com/
You'll want to get the Absolute Annihilation 2.11 Mod, as that's the mod most people are playing. Additional maps can be optained from within the battle screen, they come at ~ 10MB a piece.
Also I'd suggest you listen to the comrade, TAK is crap. You might go for the Earte 21xx games, but I suggest you stay away from the latest one.
Rome: Total War (or Medieval: Total War) seems to be missing on your list, but if you've played Blitzkrieg I guess you propably didn't miss that one.
If you're looking for something along the quality standards of kohan or myth, (you DO know majesty, right?) or even wc3+tft... I think you're pretty much out of luck.
I lately tend to spend way more time looking for games that I haven't played to death yet and that don't suck than actually playing. Regarding current gaming industry standards, "doesn't suck" translates roughly to "doesn't make me want to mutilate random women with rusty spoons". Not that this would be a bad thing. Looking for a decent RTS is pretty similar to trying to find a rpg. You're going to find a bunch of games that might fit the genre/expectations, but at the end of the day there's nothing out right now that I feel the urge to think about while not in front of the pc. (<- yes, happened to me with the Fallouts, arcanum, wasteland and darklands - WC3tft and starcraft as well as TA, too)
(...also Final Fantasy 8, but I was stoned out of my mind at the time, so hopefully it doesn't count...)
Supreme Commander looks promising, though.
Edit:I forgot to second Dungeon Keeper 2. Great fun for a while.